{"id":"W1509868282","doi":"10.3386/w17636","title":"Rewarding Altruism? A Natural Field Experiment","year":2011,"lang":"en","type":"report","venue":"National Bureau of Economic Research","topic":"Experimental Behavioral Economics Studies","field":"Social Sciences","cited_by":17,"is_retracted":false,"has_abstract":true,"ca_institutions":"University of Toronto","funders":"National Science Foundation","keywords":"Surprise; Incentive; Altruism (biology); Donation; Blood donations; Social psychology; Psychology; Natural experiment; Prosocial behavior; Intervention (counseling); Economics; Microeconomics; Blood donor; Medicine","routes":{"ca_aff":true,"ca_fund":false,"ca_venue":false,"about_ca":false,"invisible_to_affiliation_only":false},"retraction":null,"screen":null,"direct_labels":[],"prediction":{"model_version":"metacan-v3-hybrid-931329e0061c","candidate_categories":[],"consensus_categories":[],"category_scores_codex":[0.006741505,0.0004892577,0.0006640779,0.0002715551,0.0009949825,0.0007128008,0.0007191069,0.001394238,0.004217318],"category_scores_gemma":[0.01100545,0.0003999156,0.0003870918,0.0001698493,0.001777887,0.0006431794,0.0006696057,0.001428772,0.0003394446],"about_ca_system_candidate":false,"about_ca_system_consensus":false,"about_ca_system_score_codex":0.0004776765,"about_ca_system_score_gemma":0.000518364,"about_ca_topic_candidate":false,"about_ca_topic_consensus":false,"about_ca_topic_score_codex":0.001186072,"about_ca_topic_score_gemma":0.001974032,"domain_scores_codex":[0.9971545,0.002120508,0.00007956469,0.0003160306,0.0002033044,0.0001261989],"domain_scores_gemma":[0.9745318,0.01793852,0.002846323,0.002805071,0.0004361273,0.001442093],"domain_codex":null,"domain_gemma":null,"domain_candidate":null,"domain_consensus":null,"study_design_codex":"nonrandomized_trial","study_design_gemma":"randomized_trial","study_design_scores_codex":[0.1094655,0.2480855,0.1919155,0.002293768,0.002146948,0.002444262,0.006280365,0.0121455,0.2272547,0.0387384,0.02196961,0.1372598],"study_design_scores_gemma":[0.04214668,0.2752995,0.4494367,0.0004402974,0.001174188,0.0032356,0.002860738,0.05583792,0.04727427,0.07943405,0.04235811,0.0005019624],"study_design_candidate":"randomized_trial","study_design_consensus":null,"genre_codex":"empirical","genre_gemma":"empirical","genre_scores_codex":[0.9939781,0.00007564699,0.002022233,0.0005964894,0.00005524338,0.0003637277,0.0001307468,0.00002619406,0.002751661],"genre_scores_gemma":[0.9847583,0.0001320375,0.00915236,0.001368741,0.00007182115,0.001790888,0.0001632964,0.00001076018,0.002551727],"genre_candidate":"empirical","genre_consensus":"empirical","teacher_disagreement_score":0.006741505,"threshold_uncertainty_score":0.03565294,"prediction_status":"machine_predicted_unvalidated"},"machine_scores":{"provisional":true,"baseline":true,"maturity_gate_passed":false,"score_opus":0.5531828343491543,"score_gpt":0.6017014197933672,"score_spread":0.04851858544421295,"validation_status":"score_only:v0-immature-baseline","note":"Baseline scores from an immature model (maturity gate not passed). Scores rank; they never assert a category."}}